folder accessors clean-up. still needs a lot of TLC
add guard and rspec dependencies
Update README.md
RDD for FolderAccessors
README.md fix
accessor definition clean-up
work on out_of_office and user availability
work on oof settings
Folder type support for #make_folder
add time finders for searching folders
add search_by_subject for folders
add item_accessors to generic_folder
base support for CalendarItem
remove old Event model type.
add features to base Item